Soil nail drawing interface shear test device and shear test method

A shear test and pull-out test technology, applied in the direction of using a stable shear force to test the strength of materials, measuring devices, instruments, etc., can solve the problem of lack of shear mechanical properties, inability to quantitatively obtain shear mechanical properties, and difficulty in accurately analyzing unsaturated soils. problems such as the shear strength of the middle soil nail interface, to achieve the effect of simple and practical structure

Active Publication Date: 2021-04-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing test equipment is relatively simple, only applying pressure and pulling load to the test object. For the shear problem of unsaturated soil and soil nail interface, the test process lacks the means of controlling the suction of unsaturated soil matrix, resulting in quantitative test results. Obtain the influence of matrix suction on the shear mechanical properties of the soil nail and soil interface, and it is difficult to accurately analyze the shear strength of the soil nail interface in unsaturated soil

Method used

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  • Soil nail drawing interface shear test device and shear test method
  • Soil nail drawing interface shear test device and shear test method
  • Soil nail drawing interface shear test device and shear test method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A soil nail pullout interface shear test device, such as Figure 1-6 As shown, it includes a device frame, a soil nail pull test box, a vertical pressure applying mechanism and a lateral pressure applying mechanism. The device frame includes four columns 30 on both sides, an upper beam 28 located between the columns on both sides and an upper beam 28 located between the columns on both sides. The lower cross frame 27 between the columns on both sides, the lower cross frame can be a frame and can also be a support plate, and the soil nail pull-out test box is arranged on the lower cross frame, including the casing for filling the test soil layer, located in The air pipe 12 at the top of the box and the drain pipe 24 at the bottom of the box. The box includes a top cover 8 and a lower box that is plugged and sealed with the top cover of the box. The lower box includes a cylindrical connector 6 and the box base 23, the top cover of the box and the upper end of the cylindri...

Embodiment 2

[0037] Utilize the method for carrying out shear test with above-mentioned soil nail drawing interface shear test device, may further comprise the steps:

[0038] 1) First place a drainage steel plate with drainage function at the bottom of the soil nail drawing test box, seal between the steel plate and the box body, and then fill part of the test soil layer into the drawing box;

[0039] 2) After compacting part of the test soil layer in step 1), place a horizontal pressure applying mechanism with soil nails installed in the box, then fill the remaining test soil layer 32, compact while filling, and then place the permeable stone slab and Loading cover plate with small ventilation holes, and then close the top cover of the box;

[0040] Then, according to the ground stress level required by the test, a vertical load is applied through the vertical pressure test mechanism. After the deformation is stable, the air delivery pipe on the top cover of the box is opened and the mat...

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Abstract

The invention relates to a soil nail drawing interface shear test device and a shear test method, the soil nail drawing interface shear test device comprises a device frame, a soil nail drawing test box, a vertical pressure applying mechanism and a transverse pressure applying mechanism. The device frame comprises stand columns on the two sides, an upper cross beam arranged between the stand columns on the two sides and a lower cross frame arranged between the stand columns on the two sides, the soil nail pull-out test box is arranged on the lower cross frame, and the vertical pressure applying mechanism is fixed to the upper cross beam. According to the soil nail drawing interface shear test device, the box body is arranged to be of a sealed and inserted split structure, the sealing performance after soil filling is guaranteed, the air conveying pipe and the water discharging pipe are arranged, the soil body suction force is controlled through air pressure, meanwhile, the special transverse pressure applying mechanism is designed, the soil nails can be pushed, the soil nail mounting function is achieved, and the soil nail drawing interface shear test device is quite ingenious.

Description

technical field [0001] The invention relates to the construction field, in particular to a soil nail drawing interface shear test device and a shear test method. Background technique [0002] The key to the calculation of the bearing capacity of soil nails is to determine the shear strength of the interface between the soil nail and the soil. The soil nail pull-out interface shear test is a direct and effective means to understand the shear strength of the interface between the soil nail and the soil. The interaction mechanics relationship between soil nails and soil is of great significance. At present, the existing test equipment is relatively simple, only applying pressure and pulling load to the test object. For the shear problem of unsaturated soil and soil nail interface, the test process lacks the means of controlling the suction of unsaturated soil matrix, resulting in quantitative test results. It is difficult to accurately analyze the shear strength of the soil na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/24
Inventor 李永辉牛恒宇彭飞李梦瑶刘云龙吴江龙
Owner ZHENGZHOU UNIV
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